Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bfaadbab1e21af0…

MALICIOUS

PDF

46.9 KB Created: 2020-08-31 02:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38b7111871b4c96b89e000eab1041da6 SHA-1: 23443eccd5989fe7791e0664b1dd70629ffd1e12 SHA-256: 7bfaadbab1e21af07823511ec22feb131593e7b83ef96d5f22e706e88e804347
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by a machine learning classifier and contains a significant number of embedded links. One of these links, https://ttraff.cc/wix?keyword=prestige+3+leatherface, points to known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains this URL and numerous other links to static.usrfiles.com, suggesting a link farm designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/wix?keyword=prestige+3+leatherface
    • https://static.usrfiles.com/ugd/784815_4202685b5ace4d41885afb6c55f02a53.pdf
    • https://static.usrfiles.com/ugd/3b0c81_22b57315f36947789fd65384da1317b4.pdf
    • https://static.usrfiles.com/ugd/405339_5f7395a2059f4180a7e26d73d4f3e6d3.pdf
    • https://static.usrfiles.com/ugd/b8c837_851f96e37cb9445dbee9da648d5e6290.pdf
    • https://static.usrfiles.com/ugd/a76634_f5ab022ade424368ab162493eb79e2d7.pdf
    • https://static.usrfiles.com/ugd/99965f_c3c11d66ae2f4016a37a1ebec549336b.pdf
    • https://static.usrfiles.com/ugd/b8c837_b86ad344d73a4a869059bbfbdf53c55a.pdf
    • https://static.usrfiles.com/ugd/6908d7_75f584d894284319b9af980152f105ab.pdf
    • https://static.usrfiles.com/ugd/b8c837_ecca9774b4e14120a00f63ae7b267244.pdf
    • https://static.usrfiles.com/ugd/38bf1f_4f55bb0f1b8b4d5fa955d0bff82bd9fe.pdf
    • https://static.usrfiles.com/ugd/538d67_e83cfe657c1c43b48021cd49316dccc0.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007913.bin
d4add3c9c4506de998b3d53442178754d3e98b34bb0f73756bd1eaf16b4b1be9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7913 5308 bytes
font_01_sfnt_off00008b0e.bin
50d8490c6acd0d8f63d48d75c18f8c3de0c8432c9f14754404120d037a55601d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B0E 10576 bytes

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